THE EFFECT OF PLANTING METHOD 401 



Taking the rows in regular order as they occur in the plot, the aver- 

 age total height for each row appears in the table below. The odd- 

 numbered rows are "mound" planting and the even-numbered rows 

 "side-hole" planting: 



Table i 



Row Number Average Row 



No. of trees height No. 



1 15 36.5 6 



2 20 30.1 7 



3 13 30.4 8 



4 II 19.6 9 



5 14 22.2 10 



It will be observed that in no case is the average height of trees in 

 the even-numbered rows equal to that of the adjacent odd-numbered 

 rows. 



A record of annual survivals is given 'in Table 2. 



Table 2 



Number alive 



Method Number , '^ — > 



planted Oct., 1912 Nov., 1915 Nov., 1916 



"Mound" planting 100 91 TJ 77 



"Side-hole" planting 100 88 82 82 



To find out if this difference in rate of growth is in evidence on other 

 sites, a similar planting established in 1913, one year later than the 

 foregoing, was measured in April, 1917, before any new growth had 

 started. This plot is on a steep northwest slope, and the soil is very 

 rocky. The elevation is about the same as the mesa area described 

 above, but is, on the whole, a more typical yellow-pine site, due to the 

 northern aspect. One hundred trees were planted here by each method 

 in alternate rows of 33 to 34 trees each. Only the total height was 

 taken. A good many of these trees have had their growth retarded by 

 tip-moth injury. The average height of the "mound"-planted trees 

 was found to be ^(^i.^S in^'bcs. while the "side-hole"-planted trees aver- 

 age only 13.78 inches, a difference of 2.57 inches, or 18.65 per cent, in 

 favor of the "mound" planting. At the same stage of growth the 

 "mound"-planted trees on the mesa were 19.55 per cent taller than the 

 "side-hole," this latter figure being arrived at by subtracting the 1916 

 growth from the total height. 



The average height of trees in each row on the north slope is as fol- 

 lows — odd-numbered rows "mound" planted, even-numbered rows 

 "side-hole" planted : 



